I'm beginning to feel very old - but maybe I am at 65.
Klauss, Precision Approach Radar was, at one time, common almost everywhere, but for a long time now it is usually only found at military airfields or joint/military fields (Norway is a good example).
As BOAC says, you basically do what the controller tells you and say nothing - unless he/she specifically asks you to respond. I don't know what a/c type(s) you are current on but if it is any of the types that rely on a high level of automation in normal operation ( such as the Airbus series) you may well find a PAR a little challenging.
For example, when the controller says 'commence descent for a 3 degree glidepath' do you know the rate of descent you need to maintain for your configuration? Good, successful, PAR approaches down to 200' DH require practice on both the part of the controller and the pilot.
Hope you get to do one sometime with a good controller - it can be a much more satisfying experience that the same old - yawn - coupled auto ILS!
Cheers
1106